Establishes the ui.* namespace for phases 2 and 3. Both catalogs complete, so the
key-parity test holds. Two English copy defects fixed while keying, because the
Portuguese must not inherit them: 'Your are not authorized' -> 'You are', and
'Please Signin again' -> 'Please sign in again'.
The server's own message in ServerError/CustomError stays verbatim — it is a
response, not UI copy (D1).
pastilhas